After going thru my references I found from a Robert Sumerall book(Leeward Publications) from the 1970's on the USS Texas BB-35 that the decks were painted Dark Blue Gray.It's listed as July 1918 Standard -Light Gray System
Light Gray on all horizontal and vertical surfaces except decks. Dark Blue Gray on all decks.
HTH
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were the decks painted or stained during ww1 or was that mainly a ww2 thing?